

When a product is purchased in the United States, most consumers assume that it is safe for use and that the manufacturer has fully disclosed any risks associated with it. Unfortunately, some products make it to market without adequate disclosures of their potential harm. When this happens, a manufacturer or another party may be held liable in a product liability case for failing to warn consumers about the risk of harm.
At Wisner Baum, we understand what the legal principle means, how failure to warn cases work, and how to build cases that help make consumer products safer for everyone. State laws, however, provide only a limited period of time to bring such cases from the date of the injury and/or the date when you suspect the product caused your injury, thus, it is important to consult with an attorney immediately upon suspecting that the product, drug, or medical device caused you harm.
Manufacturers have a duty to warn consumers about any risks of harm associated with their products. Failing to warn consumers about a hazard or potential hazard may result in liability. The duty to warn not only exists at the time the product is initially manufactured but also if newly acquired information identifies a previously undisclosed risk. They may also be held legally responsible if the warning is incomplete or unclear.
When someone is injured by a product, drug, or medical device, a product liability claim may be brought against the manufacturer, distributor, or another party. There are usually three legal principles that a product liability claim may be based on and in some cases, multiple principles may apply.
Legal principles in a product liability claim:
While some cases may involve more than one of these principles, it is important to understand that a failure to warn claim can be brought even when the product was manufactured correctly and does not contain a design defect. Failure to warn or marketing defect cases help to hold companies accountable when they fail to issue clear warnings for a product that could have avoided preventable injuries.
Failure to warn complaints can occur across a wide range of different categories including consumer products, pharmaceutical drugs, medical devices, and consumables. These cases frequently occur after reports of injuries or adverse events. They may also happen when whistleblowers come forward or as the result of forced disclosure by a regulatory agency.
Failure to warn mass tort lawsuits handled by Wisner Baum:
In our experience, failure-to-warn cases often reveal a troubling pattern: companies identified risks internally but made calculated, and often profit-based decisions, to withhold that information from consumers and regulators.
There may be several reasons why manufacturers engage in this behavior. Corporations may fear that by disclosing risks, consumers would be unwilling to purchase the product at all, or not pay as much for the product. In reality, this practice prioritizes profits over consumer safety and only focuses on protecting product sales.
Companies may also avoid fully disclosing risks or downplay dangers to help to avoid recalls, maintain consumer confidence, or prevent negative press. They may further believe that there will be little to no regulatory consequences by failing to provide clear or complete warnings if the agencies failed to take action on similar matters.
Litigation can help to expose the reasons that a manufacturer failed to adequately warn consumers about the risks associated with a product, drug, or device. In some instances these lawsuits reveal that the failure to warn was intentional.
How Attorneys Prove a Failure to Warn Claim
In product liability claims based on a failure to warn, a person must be able to show that a manufacturer knew or should have known about the risks or dangers that were not disclosed. The best way to ensure that a company is held liable for failing to warn consumers is by consulting with an experienced attorney. Wisner Baum’s attorneys can help to investigate the claim, gather evidence, and pursue legal action against a potentially liable corporation.
Evidence that may be critical in a failure to warn claim:
Uncovering what a company knew and when they knew it is critical in failure to warn cases. For instance, documents known as “The Monsanto Papers,” proved critical in exposing corporate malfeasance and helped attorneys secure multi-billion dollar settlements and jury verdicts on behalf of Roundup victims nationwide.
Attorneys with Wisner Baum helped to uncover these documents during the discovery process. Their work unveiled a decades-long campaign by the corporation to manipulate data, influence regulatory action, and minimize the potential risks of the weedkiller’s main ingredient, glyphosate.
Damages in failure to warn mass tort lawsuits may include recovery for medical expenses, lost wages, long-term disability, diminished earning capacity, and more. Depending on the circumstances of the case, individuals may be able to receive compensation for the emotional distress and pain and suffering caused by a company’s failure to warn. In egregious cases, a plaintiff may be entitled to punitive damages. Punitive damages are designed to punish defendants for intentional misconduct.
Product liability cases that become mass tort litigation may receive larger settlements due to their size and publicity. Public scrutiny may influence companies to settle and make recompense for wrongdoing alleged during court proceedings.
If you believe a company failed to warn you about the risks of a product, it is strongly recommended that you speak with an attorney as soon as possible. Consulting with an experienced lawyer early in the process can help to protect your rights and increase the likelihood of success. Taking proactive steps like documenting exposure, providing detailed information about the progression of symptoms, and submitting evidence related to product use can help to strengthen your case.
In addition, laws only provide a limited time period for you to bring a claim once you have been injured and/or the problem has been discovered. If you miss that window of time, your claim will be barred, and you will be unable to recover. Therefore, it is very important that you speak with an attorney at soon as you even suspect a product, drug, or medical device might have injured you.
The failure to warn attorneys at Wisner Baum have decades of experience holding corporations accountable for failing to adequately disclose known or discovered risks about a product. Attorneys at the firm played pivotal roles in past mass tort lawsuits, such as cases regarding Roundup, Zantac, Cymbalta, Actos, Gardasil, Valsartan, Benicar, Abilify, Home Depot Ladders, nutritional supplements, and many other products, drugs, and devices.
Attorneys with the firm have also served on leadership and steering committees in past and present product liability lawsuits. We have extensive experience managing complex scientific and regulatory evidence and have proven ourselves as leaders in the industry.
If you or a loved one has been injured by a product, drug, or medical device, contact Wisner Baum at (310) 207-3233 to schedule a free consultation.
"Wisner Baum gave exceptional attention to all aspects of the case, detailed inquiry, and tenacious overview of all the information submitted. The paralegals are efficient and diligent. I was completely surprised to find an empathic personal message to take care of my own health during the challenging time of being a full-time caretaker.*"
In May of 2019, the jury in the case of Pilliod et al. v, Monsanto Company ordered the agrochemical giant to pay $2.055 billion in damages to the plaintiffs, Alva and Alberta Pilliod, a Bay Area couple in their 70s. R. Brent Wisner served as co-lead trial attorney for the Pilliods, delivering the opening and closing statements and cross-examining several of Monsanto’s experts. Wisner Baum managing shareholder, Michael Baum and attorney Pedram Esfandiary also served on the trial team in the Pilliod case.
The judge later reduced their award to $87M. Monsanto appealed the Pilliod’s verdict which the California Court of Appeal for the First Appellate District denied on August 9, 2021. Monsanto then requested the California Supreme Court review the appeal’s court decision, which the court denied on Nov. 17, 2021. Monsanto (Bayer) then submitted a petition for a writ of certiorari with the U.S. Supreme Court which SCOTUS denied on June 27, 2022, allowing the final judgment of $87M to remain intact.
$289.2 million jury verdict in Monsanto Roundup trial
Wisner Baum co-represented Dewayne “Lee” Johnson in the first Roundup cancer lawsuit to proceed to trial. On Aug. 10, 2018, a San Francisco jury ordered Monsanto to pay $39.25 million in compensatory damages and $250 million in punitive damages to Mr. Johnson, a former groundskeeper who alleged exposure to Monsanto’s herbicides caused him to develop terminal non-Hodgkin lymphoma.
Months after the jury verdict, the judge overseeing the trial reduced the punitive damages to $39.25 million. Mr. Johnson decided to accept the remittitur, bringing the adjusted amount awarded to Mr. Johnson $78.5 million.
Monsanto (Bayer) appealed the verdict and Johnson cross appealed. On July 20, 2020, the First Circuit Court of Appeals upheld the verdict against Monsanto but reduced Mr. Johnson’s award to $20.5 million. The company chose not to take the case to the U.S. Supreme Court, ending the litigation.
In 2016, Wisner Baum attorney Timothy A. Loranger and six other attorneys in the Plaintiffs’ Management Committee were able to secure a $265 million settlement for victims of the 2015 Amtrak 188 derailment in Philadelphia, one of the largest in the U.S. for 2016.
The time limit for filing a failure to warn lawsuit varies by state and depends on other factors, including the type of product involved. Most states have statutes of limitations ranging from one to four years, but the clock may start from the date of injury, the date you discovered the injury, or the date you learned the product caused your harm. Some states also have statutes of repose that set an absolute deadline regardless of when you discovered your injury. Because these deadlines are strict and missing them can bar your claim entirely, we highly recommend consulting with an attorney as soon as you can.
Failure to warn is considered a product defect and generally falls under strict liability. Manufacturers have a duty to warn consumers about any known or discovered safety issues or risks of harm. When they fail to fully disclose safety information, they may be held liable in a product liability lawsuit.
Under federal and state product liability law, manufacturers generally must warn about hidden, non‑obvious dangers associated with foreseeable uses of their products. However, some states may not require warnings about risks that are open and obvious or already generally known.
Parties that may be held liable for a failure to warn include product manufacturers, distributors, and retailers, depending on the state laws involved. An experienced attorney can help to determine what parties might be legally responsible and how to hold them accountable.
In most failure to warn cases, your attorney needs to show that the manufacturer knew or should have known about the risk. This can include actual knowledge—such as internal studies, adverse event reports, or employee communications—or constructive knowledge, meaning information that was reasonably available through industry research, scientific literature, or regulatory guidance. In our experience, discovery in failure to warn cases often reveals that companies had far more information about risks than they disclosed to the public.
Failure to warn is a legal principle often utilized in product liability cases. While it may be used in conjunction with a design or manufacturing defect claim, it may also stand alone, meaning that the product does not have to be defective to have caused the harm only that the manufacturer’s failure to warn was the cause of the harm.
Failure to warn is considered a tort. It falls under the umbrella of a product liability case, where a person is harmed because of the manufacturer's (or another party’s) failure to adequately disclose all safety information.
A failure to warn of risk occurs when a company fails to adequately disclose any risks of harm required by law to consumers.